it's putting new pressure on the white house to find a way to force russia to withdraw. nbc's kristen welker is live for us at the white house with more this afternoon. kristen, first of all, what are president obama's options here? >> well, he doesn't have a whole lot of options, craig. the president has been quite clear that a military option is off the table. so right now the u.s. and its european partners are focusing on sanctions. they have so far implemented several rounds of sanctions, which have largely been targeted at individuals. on friday, president obama met with german chancellor angela merkel here at the white house, and the two made a pretty big announcement, which is that they had agreed to move forward with sectorial sanctions, if the crisis in ukraine worsens after the may 25th election. so i don't anticipate that we'll see any new sanctions prior to that. then a final decision will be based on what is actually happening in ukraine. this is significant, craig, because the u.s. had wanted to enforce sectorial sanctions, sanctions against the larger sect